U.S. patent application number 10/660531 was filed with the patent office on 2004-04-15 for container structure for fuel cell.
This patent application is currently assigned to NISSAN MOTOR CO., LTD.. Invention is credited to Inokuchi, Iwane, Yamada, Takahiro.
Application Number | 20040072059 10/660531 |
Document ID | / |
Family ID | 32025540 |
Filed Date | 2004-04-15 |
United States Patent
Application |
20040072059 |
Kind Code |
A1 |
Yamada, Takahiro ; et
al. |
April 15, 2004 |
Container structure for fuel cell
Abstract
A container structure for a fuel cell comprises a fuel cell
container, a separate plate having a plurality of orifices, an
exhaust pipe discharging gas in the fuel cell container, and a
compressed air pipe sending a compressed air into the fuel cell
container. In the container structure, the inside of the fuel cell
container is divided into an exhaust manifold unit and a cell
housing unit housing the fuel cell by the separate plate, the
exhaust pipe is attached to connect an exhaust port provided on the
exhaust manifold unit and an exhaust outlet provided on a surface
of a vehicle, an air pressure in the exhaust manifold unit is set
at an atmospheric pressure, and an air pressure in the cell housing
unit is set equal to or smaller than a fuel cell gas pressure and
equal to or larger than the atmospheric pressure by the compressed
air pipe.
Inventors: |
Yamada, Takahiro;
(Yokosuka-shi, JP) ; Inokuchi, Iwane;
(Yokohama-shi, JP) |
Correspondence
Address: |
FOLEY AND LARDNER
SUITE 500
3000 K STREET NW
WASHINGTON
DC
20007
US
|
Assignee: |
NISSAN MOTOR CO., LTD.
|
Family ID: |
32025540 |
Appl. No.: |
10/660531 |
Filed: |
September 12, 2003 |
Current U.S.
Class: |
429/444 ;
429/508 |
Current CPC
Class: |
H01M 8/04104 20130101;
H01M 8/2475 20130101; Y02E 60/50 20130101; H01M 2250/20 20130101;
Y02T 90/40 20130101 |
Class at
Publication: |
429/038 |
International
Class: |
H01M 008/24 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 9, 2002 |
JP |
2002-296315 |
Claims
What is claimed is:
1. A container structure for a fuel cell, comprising: a fuel cell
container; a separate plate having a plurality of orifices; an
exhaust pipe discharging gas in the fuel cell container; and a
compressed air pipe sending a compressed air into the fuel cell
container, wherein the inside of the fuel cell container is divided
into an exhaust manifold unit and a cell housing unit housing the
fuel cell by the separate plate, the exhaust pipe is attached to
connect an exhaust port provided on the exhaust manifold unit and
an exhaust outlet provided on a surface of a vehicle, and an air
pressure in the exhaust manifold unit is set at an atmospheric
pressure, and the compressed air pipe is attached onto the cell
housing unit, and an air pressure in the cell housing unit is set
equal to or smaller than a fuel cell gas pressure and equal to or
larger than the atmospheric pressure.
2. A container structure for a fuel cell, comprising: a fuel cell
container; a separate plate having a plurality of orifices; and an
exhaust pipe discharging gas in the fuel cell container, wherein
the inside of the fuel cell container is divided into an exhaust
manifold unit and a cell housing unit housing the fuel cell by the
separate plate, the exhaust pipe is attached to connect an exhaust
port provided on the exhaust manifold unit and an exhaust outlet
provided on a surface of a vehicle, and an exhaust fan is provided
in any one of the insides of the exhaust pipe and the exhaust
manifold unit.
3. A container structure for a fuel cell, comprising: a fuel cell
container; an exhaust pipe discharging gas in the fuel cell
container; a pipe making the fuel cell container and the exhaust
pipe communicate with each other through an orifice; and a
compressed air pipe sending a compressed air into the fuel cell
container, wherein the orifice and the pipe are provided above the
fuel cell container, an air pressure in the pipe is set at an
atmospheric pressure by connecting the pipe to the exhaust pipe
connected to an exhaust outlet provided on a surface of a vehicle,
and the compressed air pipe is attached onto the fuel cell
container, and an air pressure in the fuel cell container is set
equal to or smaller than a fuel cell gas pressure and equal to or
larger than the atmospheric pressure.
4. A container structure for a fuel cell according to claim 1,
wherein the exhaust manifold unit is provided on a corner of an
upper portion of the fuel cell container.
5. A container structure for a fuel cell according to claim 1,
wherein the compressed air pipe is attached onto a side face of the
cell housing unit.
6. A container structure for a fuel cell according to claim 1,
wherein the exhaust outlet is provided on a side face of the
vehicle.
7. A container structure for a fuel cell according to claim 1,
wherein the exhaust pipe is bent at least at one spot on the way to
the exhaust outlet.
8. A container structure for a fuel cell according to claim 1,
wherein the exhaust port is provided above the exhaust manifold
unit.
9. A container structure for a fuel cell according to claim 1,
wherein diameter of the orifices close to the exhaust port is set
small, and diameter of the orifices distant from the exhaust port
is set large.
10. A container structure for a fuel cell according to claim 1,
wherein the fuel cell container is configured to be divided into an
upper lid portion and a container portion.
11. A container structure for a fuel cell according to claim 1,
wherein the fuel cell container is configured to be divided into an
upper lid portion and a container portion, and the separate plate
is sandwiched and fixed between the upper lid portion and the
container portion.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a container structure
housing a fuel cell of a fuel cell vehicle.
[0003] 2. Description of the Related Art
[0004] The gazette of Japanese Patent Application Laid-Open No.
H8-31436 (published in 1996) discloses a conventional container
structure for a fuel cell.
SUMMARY OF THE INVENTION
[0005] In the foregoing conventional technology, a ventilation port
is directly attached onto a container which houses a fuel cell, and
outside air is taken therefrom to ventilate the inside of the
container. In this case, the number of revolutions of a ventilation
fan or opening/closing of an open valve is controlled in response
to the concentration of hydrogen permeating a fuel cell stack, thus
exhausting permeation hydrogen to the air. Hence, there is a
possibility that a short circuit can occur due to dirt such as
dust, humidity and the like, which enter the fuel cell container
from the outside while the outside air is being taken in or the
permeation hydrogen is being exhausted to the air.
[0006] The present invention was made in consideration of the
above-described problems. It is an object of the present invention
to provide a container structure for a fuel cell where there is a
small possibility of entry of dirt such as dust, humidity and the
like from the outside.
[0007] The first aspect of the present invention provides a
container structure for a fuel cell, comprising: a fuel cell
container; a separate plate having a plurality of orifices; an
exhaust pipe discharging gas in the fuel cell container; and a
compressed air pipe sending a compressed air into the fuel cell
container, wherein the inside of the fuel cell container is divided
into an exhaust manifold unit and a cell housing unit housing the
fuel cell by the separate plate, the exhaust pipe is attached to
connect an exhaust port provided on the exhaust manifold unit and
an exhaust outlet provided on a surface of a vehicle, and an air
pressure in the exhaust manifold unit is set at an atmospheric
pressure, and the compressed air pipe is attached onto the cell
housing unit, and an air pressure in the cell housing unit is set
equal to or smaller than a fuel cell gas pressure and equal to or
larger than the atmospheric pressure.
[0008] The second aspect of the present invention provides a
container structure for a fuel cell, comprising: a fuel cell
container; a separate plate having a plurality of orifices; and an
exhaust pipe discharging gas in the fuel cell container, wherein
the inside of the fuel cell container is divided into an exhaust
manifold unit and a cell housing unit housing the fuel cell by the
separate plate, the exhaust pipe is attached to connect an exhaust
port provided on the exhaust manifold unit and an exhaust outlet
provided on a surface of a vehicle, and an exhaust fan is provided
in any one of the insides of the exhaust pipe and the exhaust
manifold unit.
[0009] The third aspect of the present invention provides a
container structure for a fuel cell, comprising: a fuel cell
container; an exhaust pipe discharging gas in the fuel cell
container; a pipe making the fuel cell container and the exhaust
pipe communicate with each other through an orifice; and a
compressed air pipe sending a compressed air into the fuel cell
container, wherein the orifice and the pipe are provided above the
fuel cell container, an air pressure in the pipe is set at an
atmospheric pressure by connecting the pipe to the exhaust pipe
connected to an exhaust outlet provided on a surface of a vehicle,
and the compressed air pipe is attached onto the fuel cell
container, and an air pressure in the fuel cell container is set
equal to or smaller than a fuel cell gas pressure and equal to or
larger than the atmospheric pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The invention will now be described with reference to the
accompanying drawings wherein;
[0011] FIG. 1 is a cross-sectional view illustrating a container
structure for a fuel cell of the first embodiment according to the
present invention;
[0012] FIG. 2 is a schematic perspective view illustrating the
container structure for the fuel cell of the first embodiment
according to the present invention;
[0013] FIG. 3 is a cross-sectional view illustrating a container
structure for the fuel cell of the second embodiment according to
the present invention;
[0014] FIG. 4 is a schematic perspective view illustrating the
container structure for the fuel cell of the second embodiment
according to the present invention;
[0015] FIG. 5 is a cross-sectional view illustrating a container
structure for the fuel cell of the third embodiment according to
the present invention;
[0016] FIG. 6 is a schematic perspective view illustrating the
container structure for the fuel cell of the third embodiment
according to the present invention;
[0017] FIG. 7 is a cross-sectional view illustrating the container
structure for the fuel cell of the fourth embodiment according to
the present invention;
[0018] FIG. 8 is a schematic perspective view illustrating the
container structure for the fuel cell of the fourth embodiment
according to the present invention; and
[0019] FIG. 9 is a view illustrating a separate plate.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0020] A container structure for a fuel cell according to the
present invention, in which a fuel cell 1 is housed in a container
and mounted on a vehicle, will be described by use of FIGS. 1 to
9.
[0021] (First Embodiment)
[0022] A configuration of a first embodiment will be described by
use of FIGS. 1, 2 and 9.
[0023] The first embodiment includes the fuel cell 1, the fuel gas
pipe 2, the air pipe 3, the exhaust pipe 7, the compressed air pipe
8, and the fuel cell container 12.
[0024] As the fuel cell 1, a polymer electrolyte fuel cell (PEFC),
a solid oxide fuel cell (SOFC) and the like can be utilized,
whereas no particular limitations are imposed thereon. The fuel gas
pipe 2 and the air pipe 3 are attached to the fuel cell 1, and
supply fuel gas (hydrogen and the like) and oxidizing gas (air and
the like) to the fuel cell 1. The fuel cell container 12 includes
the exhaust manifold unit 5 as an upper lid portion and the cell
housing unit 4 as a container portion. In addition, the separate
plate 9 is sandwiched and fixed between the exhaust manifold unit 5
and the cell housing unit 4 in the inside of the fuel cell
container 12.
[0025] The orifices 6 are provided at all of the four corners and
the center on the separate plate 9. Moreover, as shown in FIG. 9,
with regard to the diameters of the orifices 6 provided in the
separate plate 9, orifices 6 close to the exhaust port 13 are set
small in diameter, and orifices 6 distant therefrom are set large
in diameter.
[0026] The fuel cell 1 into which the fuel gas pipe 2 and the air
pipe 3 are attached are housed in the cell housing unit 4.
Moreover, the compressed air pipe 8 is attached onto the corner of
the side face of the cell housing unit 4. The exhaust pipe 7
extended from the exhaust port 13 to the vehicle side face 15 is
attached onto the upper portion of the exhaust manifold unit 5.
This exhaust pipe 7 is bent on the way from the exhaust port 13 to
the vehicle side face 15.
[0027] Next, the operation of the first embodiment will be
described.
[0028] When hydrogen permeates the fuel cell 1, air compressed by a
compressor for supply to the fuel cell 1 is divided and sent to the
cell housing unit 4 from the compressed air pipe 8. In this case,
with regard to the compressed air sent to the cell housing unit 4,
air passing through an air filter (not shown) attached in the
vicinity of the compressor is sent. Accordingly, dirt such as dust
in the compressed air is removed. The air pressure in the cell
housing unit 4 is set equal to or smaller than the fuel cell gas
pressure and equal to or larger than the atmospheric pressure by
the compressed air sent from the compressed air pipe 8. Therefore,
an air pressure difference occurs between the cell housing unit 4
and the exhaust manifold unit 5, which is at the atmospheric
pressure. Here, the fuel cell gas pressure represents pressures of
the fuel gas and oxidizing gas in the fuel cell stack. Then, the
permeation hydrogen flows into the exhaust manifold unit 5 through
the orifices 6 while accelerating a flow velocity thereof by the
air pressure difference. Then, the hydrogen is gathered together at
the exhaust pipe 7 attached onto the exhaust port 13, and then
discharged to the outside of the vehicle from the exhaust outlet 14
located on the vehicle side face 15.
[0029] As described above, in the first embodiment, a structure is
configured, in which the permeation hydrogen in the fuel cell
container 12 is gathered together by the exhaust pipe 7 while
accelerating the flow velocity by the air pressure difference, and
then exhausted to the outside of the vehicle. Therefore, it is
difficult for dirt such as dust to enter the fuel cell container.
In addition, a structure is configured, in which the exhaust outlet
14 of the exhaust pipe 7 is located on the vehicle side face 15
without providing the exhaust outlet 14 directly to the fuel cell
container 12. Therefore, dirt, water and the like can be prevented
from adhered onto the fuel cell stack.
[0030] Furthermore, a structure is configured, in which the
hydrogen is gathered together by the exhaust pipe 7 and exhausted
to the outside of the vehicle. Accordingly, the hydrogen can be
exhausted to the outside of the vehicle no matter how the fuel cell
container 12 is inclined. In addition, in the container structure
of the foregoing conventional example, a ventilation port is
provided directly to the container, and the hydrogen is exhausted
therefrom. Consequently, in some cases, the hydrogen has remained
in a dent in the inside of the vehicle, for example, on the back
surface of a car hood. On the contrary, the container structure of
the present invention is a structure in which the hydrogen is
gathered together at one spot for exhausting and exhausted to the
outside of the vehicle, and therefore, the hydrogen does not remain
in the dent and the like in the inside of the vehicle. Moreover, a
permeation hydrogen sensor can be disposed easily in the fuel cell
container 12.
[0031] Moreover, a structure is configured, in which a difference
between the gas pressure in the fuel cell 1 and the air pressure
outside the fuel cell 1 is reduced. Consequently, the permeation
amount of the gas in the fuel cell 1 can be controlled.
[0032] Referring to FIG. 1, the exhaust manifold unit 5 is
constructed so as not to be high, and to be narrow when compared
with the cell housing unit 4. Hence, the exhaust manifold unit 5
does not lose the flow velocity accelerated by the air pressure
difference. Specifically, if the space of the exhaust manifold unit
5 is wide, the permeation hydrogen that has been accelerated is
diffused therein and decelerated. Consequently, the hydrogen is not
exhausted to the outside of the vehicle efficiently. However,
because the container structure of the present invention has the
exhaust manifold unit 5, which is narrow, the permeation hydrogen
can be exhausted securely, and further, the fuel cell container 12
can be space-saving.
[0033] The separate plate 9 can be installed easily because the
separate plate 9 is just sandwiched between the upper lid portion
and container portion of the fuel cell container 12.
[0034] With regard to the diameters of the orifices 6, orifices 6
close to the exhaust port 13 are set small in diameter, and
orifices 6 distant therefrom are set large in diameter. Thus, the
flow amount of gas exhausted from the large diameter orifices 6
becomes larger than the flow amount of gas exhausted from the small
diameter orifices 6. Hence, the hydrogen remaining in the exhaust
manifold unit 5 can be exhausted efficiently.
[0035] Moreover, because the exhaust pipe 7 is bent on the way to
the vehicle side face 15, the entry of falling dust and the like
into the exhaust manifold unit 5 is eliminated. Moreover, though
not shown, a filter may be provided on the exhaust outlet 14 for
the purpose of preventing the entry of dust and the like.
[0036] (Second Embodiment)
[0037] A configuration of a second embodiment will be described by
use of FIGS. 3, 4 and 9. Note that, in the drawings, the same
reference numerals will be given to portions similar to those of
the first embodiment in the configuration of the container
structure for the fuel cell of this embodiment, and repeated
description will be omitted.
[0038] The second embodiment includes the fuel cell 1, the fuel gas
pipe 2, the air pipe 3, the exhaust pipe 7, the separate plate 9,
the exhaust fan 10, and the fuel cell container 22. Further, the
orifices 6 are provided in the separate plate 9. In this
embodiment, the compressed air pipe 8 is not provided, but the
exhaust fan 10 is provided in the vicinity of the exhaust port 13
of the exhaust pipe 7.
[0039] The operation of the second embodiment will be
described.
[0040] When hydrogen permeates the fuel cell 1, an air pressure in
the exhaust manifold unit 5 is made negative relative to the
atmospheric pressure by the exhaust fan 10. Thus, an air pressure
difference occurs between the cell housing unit 4 and the exhaust
manifold unit 5. Then, the permeation hydrogen flows into the
exhaust manifold unit 5 through the orifices 6 while accelerating a
flow velocity thereof by the air pressure difference, and then is
discharged to the outside of the vehicle from the exhaust port 14
located on the vehicle side face 15.
[0041] As described above, in the second embodiment, a structure is
configured, in which the permeation hydrogen in the fuel cell
container 22 is gathered together by the exhaust pipe 7 while
accelerating the flow velocity by the air pressure difference, and
then exhausted to the outside of the vehicle. Therefore, it is
difficult for dirt such as dust to enter the fuel cell container.
In addition, a structure is configured, in which the exhaust outlet
14 of the exhaust pipe 7 is located on the vehicle side face 15
without providing the exhaust outlet 14 directly to the fuel cell
container 22. Therefore, dirt, water and the like can be prevented
from adhering onto the fuel cell stack.
[0042] Moreover, when the exhaust fan 10 is provided in the exhaust
pipe 7, the gas sucked through the orifices 6 is gathered, thus
making it possible to miniaturize the exhaust fan 10. Furthermore,
because the exhaust fan 10 attached into the exhaust pipe 7 is
miniaturized, it is made possible to enhance the degree of freedom
in the attachment position of the exhaust fan 10 into the exhaust
pipe 7.
[0043] The attachment position of the exhaust fan is a mere
example, and for example, even if the exhaust fan is attached into
the exhaust manifold unit 5, a similar effect can be obtained.
[0044] (Third Embodiment)
[0045] First, a configuration of a third embodiment will be
described by use of FIGS. 5, 6 and 9. Note that, in the drawings,
the same reference numerals will be given to portions similar to
those of the first embodiment in the configuration of the cell
container for the fuel cell of this embodiment, and repeated
description will be omitted.
[0046] The third embodiment includes the fuel cell 1, the fuel gas
pipe 2, the air pipe 3, the exhaust pipe 7, the compressed air pipe
8, the pipe 11, and the fuel cell container 32.
[0047] The fuel cell 1 into which the fuel gas pipe 2 and the air
pipe 3 are attached is housed in the cell housing unit 4 of the
fuel cell container 32. The compressed air pipe 8 is attached onto
the corner of the side face of the cell housing unit 4. Moreover,
the pipes 11 are provided as exhaust manifolds above the cell
housing unit 4.
[0048] Three pieces of the pipes 11 are arranged from one vertex of
the upper surface of the fuel cell container 32 toward the three
remaining vertexes. Each of the pipes 11 and the fuel cell
container 32 are connected to each other by each of the orifices 6
attached on the four corners on the upper surface of the fuel cell
container 32. Then, a point where the respective pipes 11 intersect
is attached to the exhaust pipe 7 that is extended to the vehicle
side face 15 and bent on the way.
[0049] Next, the operation of the third embodiment will be
described.
[0050] When hydrogen permeates the fuel cell 1, air compressed by a
compressor for supply to the fuel cell 1 is divided and sent to the
cell housing unit 4 from the compressed air pipe 8. The air
pressure in the cell housing unit 4 is set equal to or smaller than
the fuel cell gas pressure and equal to or larger than the
atmospheric pressure by the compressed air sent from the compressed
air pipe 8. Therefore, air pressure differences occur between the
cell housing unit 4 and the pipes 11 under the atmospheric
pressure. Then, the hydrogen permeating the fuel cell 1 flows into
the pipes 11 through the orifices 6 while accelerating a flow
velocity thereof by the air pressure differences. Then, the
hydrogen is gathered together at the exhaust pipe 7 attached onto
the exhaust port 13, and then discharged to the outside of the
vehicle from the exhaust outlet 14 located on the vehicle side face
15.
[0051] As described above, in the third embodiment, a structure is
configured, in which the permeation hydrogen in the fuel cell
container 32 is gathered together by the exhaust pipe 7 while
accelerating the flow velocity by the air pressure difference, and
then exhausted to the outside of the vehicle. Therefore, it is
difficult for dirt such as dust to enter the fuel cell container.
In addition, a structure is configured, in which the exhaust outlet
14 of the exhaust pipe 7 is located on the vehicle side face 15
without providing the exhaust outlet 14 directly to the fuel cell
container 32. Therefore, dirt, water and the like can be prevented
from adhering onto the fuel cell stack.
[0052] Moreover, as shown in FIG. 9, with regard to the diameters
of the orifices 6 attached onto the fuel cell container 32,
orifices 6 close to the exhaust port 13 are set small in diameter,
and orifices 6 distant therefrom are set large in diameter. Thus,
the hydrogen accumulated in the pipes 11 can be exhausted
efficiently.
[0053] Furthermore, because the pipes 11 are attached directly onto
the orifices 6, the separate plate 9 can be eliminated, and in
addition, by adjusting the diameters of the pipes 11, the flow
velocity of the gas can be controlled, and further, the flow amount
thereof can be restricted. Hence, the exhaust flow amount of the
compressed air can be reduced more than in the first
embodiment.
[0054] (Fourth Embodiment)
[0055] First, a configuration of a fourth embodiment will be
described by use of FIGS. 7 and 8. Note that, in the drawings, the
same reference numerals will be given to portions similar to those
of the first embodiment in the configuration of the fuel cell
container of this embodiment, and repeated description will be
omitted.
[0056] The fourth embodiment includes the fuel cell 1, the fuel gas
pipe 2, the air pipe 3, the exhaust pipe 7, the compressed air pipe
8, the separate plate 19, the pipe 11, and the fuel cell container
42.
[0057] The fuel cell container 42 as a cuboid is composed of a
hexagonal columnar space (cell housing unit 24) and two triangular
columnar spaces (exhaust manifold units 25), in which the exhaust
manifold units 25 are provided on the corners of the fuel cell
container 24.
[0058] Then, the separate plates 19 are sandwiched and fixed
between the cell housing unit 24 and the exhaust manifold units 25,
in which the orifices 6 are provided. In addition, the fuel cell 1
into which the fuel gas pipe 2 and the air pipe 3 are attached is
disposed in the cell housing unit 24 of the fuel cell container 42.
Moreover, the compressed air pipe 8 is attached onto the corner of
the side face of the cell housing unit 24. Furthermore, the pipe 11
is located above the exhaust manifold units 25, connected thereto,
respectively, and connects these two exhaust manifold units 25 to
each other. This pipe 11 is attached to the exhaust pipe 7 that is
extended to the vehicle side face 15 and bent on the way.
[0059] Next, the operation of the fourth embodiment will be
described.
[0060] When hydrogen permeates the fuel cell 1, air compressed by a
compressor for supply to the fuel cell 1 is divided and sent to the
cell housing unit 24 from the compressed air pipe 8. The air
pressure in the cell housing unit 24 is set equal to or smaller
than the fuel cell gas pressure and equal to or larger than the
atmospheric pressure by the compressed air sent from the compressed
air pipe 8. Therefore, air pressure differences occur between the
cell housing unit 24 and the exhaust manifold units 25, which is
under the atmospheric pressure. Then, the hydrogen permeating the
fuel cell 1 flows into the exhaust manifold units 25 through the
orifices 6 while accelerating a flow velocity thereof by the air
pressure differences. Then, the hydrogen is gathered together at
the exhaust pipe 7 attached onto the exhaust port 13, and then
discharged to the outside of the vehicle from the exhaust outlet 14
located on the vehicle side face 15.
[0061] As described above, in the fourth embodiment, a structure is
configured, in which the permeation hydrogen in the fuel cell
container 42 is gathered together by the exhaust pipe 7 while
accelerating the flow velocity by the air pressure difference, and
then exhausted to the outside of the vehicle. Therefore, it is
difficult for dirt such as dust to enter the fuel cell container.
In addition, a structure is configured, in which the exhaust outlet
14 of the exhaust pipe 7 is located on the vehicle side face 15
without providing the exhaust outlet 14 directly to the fuel cell
container 42. Therefore, dirt, water and the like can be prevented
from being adhered onto the fuel cell stack.
[0062] In addition, a structure is configured, in which the narrow
exhaust manifold units 25 that do not lose the flow velocity
accelerated by the air pressure difference are added. Therefore,
the fuel cell container 42 can be space-saving.
[0063] As shown in FIG. 9, with regard to the diameters of the
orifices 6 attached onto the separate plate 19, orifices 6 close to
the inlets of the pipe 11 located above the exhaust manifold units
25 are set small in diameter, and orifices 6 distant therefrom are
set large in diameter. Thus, the hydrogen accumulated in the
exhaust manifold units 25 can be exhausted efficiently.
[0064] Moreover, by adopting the configuration like this
embodiment, it is possible to reduce the number of pipes 11 and to
save the space as compared with the third embodiment.
[0065] Furthermore, by providing the separate plates 19 as in this
embodiment, it is made possible to reduce the area of the separate
plates 19 as compared with the first embodiment.
[0066] Each of the embodiments described above is only a mere
example. Regarding the first and second embodiments, the number and
diameter of the orifices attached onto the separate plate can be
set in accordance with the size and shape of the fuel cell
container. Regarding the third and fourth embodiments, the number
and diameter of the orifices and the number and attachment method
of the pipes can be set according to needs. Moreover, as in the
second embodiment, the compressed air pipe is eliminated, and the
exhaust fan is attached, thus making it possible to obtain a
similar effect. Furthermore, by providing both of the exhaust fan
and the compressed air pipe, the hydrogen can be exhausted more
efficiently.
[0067] The entire content of a Japanese Patent Application No.
P2002-296315 with a filing date of Oct. 9, 2002 is herein
incorporated by reference.
[0068] Although the invention has been described above by reference
to certain embodiments of the invention, the invention is not
limited to the embodiments described above will occur to these
skilled in the art, in light of the teachings. The scope of the
invention is defined with reference to the following claims.
* * * * *